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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>true</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_001_014_2353"> </a>NAME</h4><blockquote>true - return true value</blockquote><h4><a name = "tag_001_014_2354"> </a>SYNOPSIS</h4><blockquote><pre><code>true</code></pre></blockquote><h4><a name = "tag_001_014_2355"> </a>DESCRIPTION</h4><blockquote>The<i>true</i>utility will return with exit code zero.</blockquote><h4><a name = "tag_001_014_2356"> </a>OPTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2357"> </a>OPERANDS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2358"> </a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_2359"> </a>INPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2360"> </a>ENVIRONMENT VARIABLES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2361"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_2362"> </a>STDOUT</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_2363"> </a>STDERR</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2364"> </a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2365"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2366"> </a>EXIT STATUS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_2367"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2368"> </a>APPLICATION USAGE</h4><blockquote>This utility is typically used in shell scripts, as shown in thethe EXAMPLES section.The special built-in utility ":" is sometimes more efficient than<i>true</i>.</blockquote><h4><a name = "tag_001_014_2369"> </a>EXAMPLES</h4><blockquote>This command will be executed forever:<pre><code>while truedo commanddone</code></pre></blockquote><h4><a name = "tag_001_014_2370"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2371"> </a>SEE ALSO</h4><blockquote><i><a href="false.html">false</a></i>,<xref href=shcmds><a href="chap2.html#tag_001_009">Shell Commands</a></xref>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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